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1991
January January 1991; 128 (1): 7 - 168	February February 1991; 128 (2): 171 - 325	March March 1991; 128 (3): 329 - 484, R1 - R20
April April 1991; 129 (1): 1 - 148, R1 - R4	May May 1991; 129 (2): 163 - 316, R5 - R12	June June 1991; 129 (3): 317 - 468 Supplement: -
July July 1991; 130 (1): 1 - 161	August August 1991; 130 (2): 165 - 326, R1 - R4	September September 1991; 130 (3): 329 - 489
October October 1991; 131 (1): 1 - 167, R1 - R4	November November 1991; 131 (2): 171 - 334, R5 - R8	December December 1991; 131 (3): 337 - 497, R9 - R12 Supplement: -